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Question 27: A sample contains 98% stable 1271(lodine) and 2 % unstable 1311. The half life...
A sample contains 92% stable 40 Ar and 8 % unstable 39 Ar. The half life...
A sample contains 92% stable 40 Ar and 8 % unstable 39 Ar. The half life of the unstable 39 Ar is 270 years. Calculate the activity (the number of decay per second) for one gram of this sample. (8%) Answer:
lodine 131 has a half life of 8 days and decays by a first order process (as is always the case for radioactive decay)
lodine 131 has a half life of 8 days and decays by a first order process (as is always the case for radioactive decay). How much of a 46 gram sample of iodine 131 will remain after 8 days? Report your answer in grams.
10) The half-life of lodine-131 is 8 days. The initial amount is 20 milligrams. a) Find...
10) The half-life of lodine-131 is 8 days. The initial amount is 20 milligrams. a) Find a function which gives the amount of lodine-131, Act), in milligrams, t days later. Round k, the decay constant, to four decimal places. b) Determine the length of time it takes for 70% of the material to decay. Round your answer to two decimal places. Be sure to label the answer.
1-2 lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 4.0x10 lodine-131 atoms, how many are left after approximately 1 month? 1-131 has a half- life o...
1-2
lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 4.0x10 lodine-131 atoms, how many are left after approximately 1 month? 1-131 has a half- life of 8.0 days. 2) Radium-223 decays with a half-life of 11.4 days. How long will it take for a 0.240-mol sample of radium to decay to 1.50x 10 mol?
lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with...
The half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. (b) Calculate the...
The half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. (b) Calculate the decay constant for this isotope. (c) Convert 0.350 μCi to the SI unit the becquerel. (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.350 μCi. (e) Suppose the activity of a certain 131I sample is 6.10 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity...
The half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. s (b) Calculate...
The half-life of 131I is 8.04 days. (a) Convert the half-life to seconds. s (b) Calculate the decay constant for this isotope. s−1 (c) Convert 0.650 μCi to the SI unit the becquerel. Bq (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.650 μCi. 131I nuclei (e) Suppose the activity of a certain 131I sample is 7.10 mCi at a given time. Find the number of half-lives the sample goes through in...
A radioactive sample contains two different types of radioactive nuclei: A, with half-life 9.0 days, and...
A radioactive sample contains two different types of radioactive nuclei: A, with half-life 9.0 days, and B, with half-life 18.0 days. Initially, the decay rate of the A-type nucleus is 256 times that of the B-type nucleus. 1) When will their decay rates be equal?
Only problem 8 please. 8. Consider the three component decay in Problem 7. The half-life of...
Only problem 8 please.
8. Consider the three component decay in Problem 7. The
half-life of the orig- inal nucleus is one day. The half-life of
the second nuclide is two days, while the third nuclide is stable.
The initial number of particles for nuclide A is 10,000, while
nuclides B and C have no initial particles. Plot the number of
particles from 0 to 10 days using ODE45 in MATLAB.
Problem 7 Consider the case where we have the...
The half-life of 52Mn is 5.59 days. (a) Convert the half-life to units of seconds. (b)...
The half-life of 52Mn is 5.59 days. (a) Convert the half-life to units of seconds. (b) What is the decay constant (in s−1) for this isotope? (c) Suppose a sample of 52Mn has an activity of 0.510 µCi. What is this activity expressed in the SI unit of becquerels (Bq)? (d) How many 52Mn nuclei are needed in the sample in part (c) to have the activity of 0.510 µCi? E. Now suppose that a new sample of 52Mn has...
1. The half-life of an isotope of phosphorus is 14.2 days. If a sample contains 3.96e16...
1. The half-life of an isotope of phosphorus is 14.2 days. If a sample contains 3.96e16 such nuclei, determine its activity.? 2. A 234-mCi sample of a radioactive isotope is purchased by a medical supply house. If the sample has a half-life of 17.4 days, how long will it keep before its activity is reduced to 28.9 mCi?
A sample contains 92% stable 40 Ar and 8 % unstable 39 Ar. The half life of the unstable 39 Ar is 270 years. Calculate the activity (the number of decay per second) for one gram of this sample. (8%) Answer:
10) The half-life of lodine-131 is 8 days. The initial amount is 20 milligrams. a) Find a function which gives the amount of lodine-131, Act), in milligrams, t days later. Round k, the decay constant, to four decimal places. b) Determine the length of time it takes for 70% of the material to decay. Round your answer to two decimal places. Be sure to label the answer.
1-2
lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with 4.0x10 lodine-131 atoms, how many are left after approximately 1 month? 1-131 has a half- life of 8.0 days. 2) Radium-223 decays with a half-life of 11.4 days. How long will it take for a 0.240-mol sample of radium to decay to 1.50x 10 mol?
lodine-131 is often used in nuclear medicine to obtain images of the thyroid. If you start with...
Only problem 8 please.
8. Consider the three component decay in Problem 7. The
half-life of the orig- inal nucleus is one day. The half-life of
the second nuclide is two days, while the third nuclide is stable.
The initial number of particles for nuclide A is 10,000, while
nuclides B and C have no initial particles. Plot the number of
particles from 0 to 10 days using ODE45 in MATLAB.
Problem 7 Consider the case where we have the...
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